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裂解态正癸烷点火延迟时间的理论研究(英)
引用本文:王鸿燕,裴闪闪,王莅,张香文,刘国柱.裂解态正癸烷点火延迟时间的理论研究(英)[J].含能材料,2020,28(5):398-406.
作者姓名:王鸿燕  裴闪闪  王莅  张香文  刘国柱
作者单位:天津大学化学工学院,教育部绿色化学技术重点实验室,化学科学与工程协同创新中心(天津),天津 300072,天津大学化学工学院,教育部绿色化学技术重点实验室,化学科学与工程协同创新中心(天津),天津 300072,天津大学化学工学院,教育部绿色化学技术重点实验室,化学科学与工程协同创新中心(天津),天津 300072,天津大学化学工学院,教育部绿色化学技术重点实验室,化学科学与工程协同创新中心(天津),天津 300072,天津大学化学工学院,教育部绿色化学技术重点实验室,化学科学与工程协同创新中心(天津),天津 300072
基金项目:Tianjin Natural Science Foundation;National Natural Science Foundation of China
摘    要:在先进飞行器发动机中,吸热碳氢燃料在进入燃烧室之前会发生热裂解反应,生成未反应燃料和小分子裂解产物的混合物(称为裂解态燃料)。本工作研究了在1300~1800 K、0.1~3.0 MPa和当量比为1.0的条件下,不同的裂解转化率、裂解压力、点火压力和自由基对正癸烷裂解着火特性的影响。通过采用一种精确的组合机理,从理论上计算了流动反应器中3.0和5.0 MPa下正癸烷裂解组分,与文献中的实验结果吻合较好。结果表明,正癸烷在3 MPa和5 MPa下裂解的出口转化率分别为46.2%和58.8%,裂解产物分布一致,但乙烯的含量随着压力的升高明显的降低,而烷烃含量随着压力的增大而增加。尽管自由基总体含量很低,但在3 MPa条件下裂解产物中的自由基浓度依然高于5 MPa条件下。对于点火延迟时间的计算结果则表明,裂解态正癸烷的点火延迟时间随着转化率的增大而延长,且在5 MPa下随着转化率的变化更明显。相同转化率下,5 MPa下的裂解态正癸烷的点火延迟时间比3 MPa下更短。此外,与无自由基的裂解正癸烷相比,裂解正癸烷中自由基的存在可以加速着火过程,转化率小于40%时,着火延迟时间缩短15%以上。

关 键 词:点火延迟时间  裂解态燃料  正癸烷  自由基  灵敏度分析
收稿时间:2020/1/14 0:00:00
修稿时间:2020/3/28 0:00:00

Theoretical Study on Ignition Delay Time of Thermally Cracked n-Decane
WANG Hong-yan,PEI Shan-shan,WANG Li,ZHANG Xiang-wen and LIU Guo-zhu.Theoretical Study on Ignition Delay Time of Thermally Cracked n-Decane[J].Chinese Journal of Energetic Materials,2020,28(5):398-406.
Authors:WANG Hong-yan  PEI Shan-shan  WANG Li  ZHANG Xiang-wen and LIU Guo-zhu
Affiliation:School of Chemical Engineering and Technology, Key Laboratory for Green Chemical Technology of Ministry of Education, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 300072, China,School of Chemical Engineering and Technology, Key Laboratory for Green Chemical Technology of Ministry of Education, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 300072, China,School of Chemical Engineering and Technology, Key Laboratory for Green Chemical Technology of Ministry of Education, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 300072, China,School of Chemical Engineering and Technology, Key Laboratory for Green Chemical Technology of Ministry of Education, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 300072, China,School of Chemical Engineering and Technology, Key Laboratory for Green Chemical Technology of Ministry of Education, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 300072, China
Abstract:Endothermic hydrocarbon fuels undergo thermal cracking before entering the combustion chamber and can produce a mixture of unreacted fuels and pyrolysis products (i.e. cracked fuels). The objective of this work is to investigate the effects of pyrolysis conversions, pyrolysis pressures, ignition pressures and free radicals on ignition characteristics of cracked n-decane over temperature of 1300-1800 K, pressure of 0.1-3.0 MPa and equivalence ratio of 1.0. Components of the thermally cracked n-decane at 3.0 and 5.0 MPa in a flow reactor were calculated theoretically using an accurately combined mechanism, which are in good agreement with the experimental results in literature. The results showed the conversion rates of n-decane cracking at 3 and 5 MPa are 46.2% and 58.8%, respectively. The distribution of cracking products is consistent, but the ethylene content decreases with the increase of pressure, while the alkane content increases with the increase of pressure. Meanwhile, the content of free radicals at 3 MPa is slightly higher than that at 5 MPa, but the content of free radicals is very low. Ignition delay time increases with the decreasing of n-decane conversion and pyrolysis pressure, while higher ignition pressure can shorten it significantly. Furthermore, the presence of free radicals in cracked n-decane could accelerate the ignition process with ignition delay time shortening more than 15% when the conversion was less than 40%, compared with that of cracked n-decane without radicals.
Keywords:ignition delay time  cracked fuels  n-decane  free radicals  sensitivity analysis
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